Accoridng this this chart, partial melting of asthenosphere occurs at this locat

Question

Accoridng this this chart, partial melting of asthenosphere occurs at this location (name the process and describe it).

According this this chart, partial melting of asthenosphere occurs at this location (name the process and describe it). The above cartoon is a cross sectional view showing a magmatic (island) arc, a subduction zone, spreading ridge, and a continent. Numbers 1 to 4 mark the location of a certain type of partial melting mechanism. Some of these may repeat the same mechanism. Answer the questions 1 through 4 below corresponding to the number on the figure above and note well the additional guidance in terms of where the melting takes place (ie what sort of rock is partially melted and where).

Explanation / Answer

At the subduction zone, the oceanic crust is pulled into the mantle. The high pressure and temperature under the upper mantle make the oceanic crust into fluid. This fluid adds to the mantle and results in the reduction of solidus nature. This is called partial melting. The process of this partial melting at the subduction zone in the mantle is termed as flux melting.

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